<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <title>example</title>
    <script src="../js/vue.js"></script>
    <style>
        .basic {
            height: 100px;
            width: 400px;
            border: 1px solid black;
        }

        .happy {
            border: 14px solid red;
            background-color: rgba(255, 255, 0, 0.644);
            background: linear-gradient(30deg, yellow, pink, orange, yellow);
        }

        .sad {
            border: 4px dashed rgb(2, 197, 2);
            background-color: gray;
        }

        .normal {
            background-color: skyblue;
        }

        .atguigu1 {
            background-color: yellowgreen;
        }

        .atguigu2 {
            font-size: 30px;
            text-shadow: 2px 2px 10px red;
        }

        .atguigu3 {
            border-radius: 20px;
        }
    </style>
</head>

<body>
    <div id="root">
        <!-- 绑定class样式--字符串写法，适用于：样式的类名不确定，需要动态指定 -->
        <div class="basic" :class="mood" @click="changeMood">test</div> <br /><br />

        <!-- 绑定class样式--数组写法，适用于：要绑定的样式个数不确定、名字也不确定 -->
        <div class="basic" :class="classArr">test</div> <br /><br />

        <!-- 绑定class样式--对象写法，适用于：要绑定的个数确定、名字也确定，但要动态决定用不用 -->
        <div class="basic" :class="classObj">test</div> <br /><br />

        <!-- 绑定style样式--对象写法 -->
        <div class="basic" :style="styleObj">test</div> <br /><br />
        <!-- 绑定style样式--数组样式 -->
        <div class="basic" :style="styleArr">test</div>
    </div>

    <script>
        Vue.config.productionTip = false

        const vm = new Vue({
            el: '#root',
            data: {
                mood: 'normal',
                classArr: ['atguigu1', 'atguigu2', 'atguigu3'],
                classObj: {
                    atguigu1: false,
                    atguigu2: false
                },
                styleObj: {
                    fontSize: '40px',
                    color: 'red'
                },
                styleObj2: {
                    backgroundColor: 'orange'
                },
                styleArr: [
                    {
                        fontSize: '60px',
                        color: 'blue'
                    },
                    {
                        backgroundColor: 'gray'
                    }
                ]
            },
            methods: {
                changeMood() {
                    const arr = ['happy', 'sad', 'normal']
                    this.mood = arr[Math.floor(Math.random() * 3)]
                }
            }
        })
    </script>
</body>

</html>